A rechargeable lithium battery includes a positive electrode including a positive current collector and a positive active material layer disposed on the positive current collector; and a negative electrode including a negative current collector, a negative active material layer disposed on the negative current collector, and a negative electrode functional layer disposed on the negative active material layer, wherein the positive active material layer includes a first positive active material including at least one of a composite oxide of metal selected from cobalt, manganese, nickel, and a combination thereof and lithium and a second positive active material including at least one of compounds represented by Chemical Formula 1 to Chemical Formula 4, and the negative electrode functional layer includes flake-shaped polyethylene particles and
Li.sub.x2Mn.sub.1-y2M′.sub.y2A.sub.2  [Chemical Formula 1]
Li.sub.x2Mn.sub.1-y2M′.sub.yO.sub.2-z2X.sub.z2  [Chemical Formula 2]
Li.sub.x2Mn.sub.2O.sub.4-z2X.sub.z2  [Chemical Formula 3]
Li.sub.x2Mn.sub.2-y2M′.sub.y2M″.sub.z2A.sub.4  [Chemical Formula 4] wherein, 0.9≤x2≤1.1, 0≤y2≤0.5, 0≤z2≤0.5, M′ and M″ are the same or different and are selected from Mg, Al, Co, K, Na, Ca, Si, Ti, Sn, V, Ge, Ga, B, As, Zr, Mn, Cr, Fe, Sr, V, and a rare earth element, and wherein A is selected from O, F, S, and P and X is selected from F, S, and P.

A positive electrode for a rechargeable lithium battery includes a positive active material for a rechargeable lithium battery that includes a first positive active material including a secondary particle including at least two agglomerated primary particles, where at least a portion of the primary particles has a radial arrangement structure, and a second positive active material having a monolith structure, wherein the first and second positive active materials each include a nickel-based positive active material, and an X-ray diffraction (XRD) peak intensity ratio (I(003)/I(104)) of the positive electrode is greater than or equal to about 3. Further embodiments provide a method of manufacturing the positive electrode for rechargeable lithium battery, and a rechargeable lithium battery including the same.

The present disclosure relates to compositions comprising at least one carbonaceous particulate material comprised of synthetic graphite particles having a BET specific surface area (SSA) of equal to or less than 4 m.sup.2/g, and further comprising between about 5 and about 75% (w/w) of at least one carbonaceous particulate material comprised of natural graphite particles coated with non-graphitic carbon and having a BET SSA of equal to or less than 8 m.sup.2/g. Such compositions are particularly useful as active material for negative electrodes in, e.g., lithium-ion batteries and the like in view of their overall favorable electrochemical properties, particularly for automotive and energy storage applications. The present disclosure also relates to the use of said non-graphitic carbon-coated natural graphite particles for preparing compositions that are suitable for being used as an active material in a negative electrode of, e.g., a lithium ion battery. The non-graphitic carbon-coated natural graphite particles described herein are also useful as a carbonaceous additive to increase, e.g., the energy density and charge rate performance of a lithium-ion battery while maintaining the power density of the cell compared to a cell with an anode absent the carbonaceous additive.

The disclosure relates to the use of fluorinated ethers such as 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMOP) as a reaction solvent to prepare fluorinated dialkyl carbonate and sulfite compounds useful in batteries, and to electrolytes containing fluorinated compounds for use in batteries containing high Ni cathodes and silicon containing anodes.

A power storage device including a negative electrode active material layer which contains carbon particles, silicon-based particles and a polyimide-based binder, in which the negative electrode active material layer has a porosity of more than 40%. The power storage device has a high charge/discharge capacity and excellent cycle characteristics.

A battery includes a housing, an electrolyte disposed in the housing, an anode disposed in the housing, and an electrode disposed in the housing and comprising an electrode material comprising manganese dioxide, and a conductive carbon coated with a metallic layer. The use of the conductive carbon coated with the metallic layer can help to control the effects of other ions such as zincate on the manganese dioxide during discharge or cycling of the battery.

The present invention relates to a negative electrode which includes a negative electrode current collector, and a negative electrode active material layer formed on the negative electrode current collector, wherein the negative electrode active material layer includes a silicon-based active material and a carbon-based active material, wherein a ratio of an average particle diameter (D.sub.50) of the carbon-based active material to an average particle diameter (D.sub.50) of the silicon-based active material is in a range of 2 to 8, and a porosity of the negative electrode is in a range of 48% to 62%.

A secondary battery includes a positive electrode for a secondary battery, a negative electrode, and an electrolytic solution. The positive electrode for a secondary battery includes a positive electrode active material for a secondary battery. The positive electrode active material for a secondary battery includes first particles and second particles. The first particles have a median diameter D50 of greater than or equal to 15 micrometers and less than or equal to 30 micrometers and each include a lithium-containing compound. The second particles have a median diameter D50 of greater than or equal to 1 micrometer and less than or equal to 10 micrometers and each include a center part that includes a lithium-containing compound and a covering part provided on a surface of the center part. The covering part includes, in order from a side closer to the center part, an underlayer and a surface layer. The underlayer includes a reaction product of a first metal alkoxide in which no alkyl group is bonded to a metal atom. The surface layer includes a reaction product of a second metal alkoxide in which the alkyl group is bonded to the metal atom. The reaction product of the second metal alkoxide is bonded to the reaction product of the first metal alkoxide.

An active material for a secondary battery negative electrode having excellent charge-discharge characteristics such as charge-discharge capacity, initial coulombic efficiency, and cycle characteristics is provided. The active material for a secondary battery negative electrode contains a composite containing a filler and a matrix. The filler contains silicon particles and the matrix contains at least one selected from the group consisting of carbon, SiOC, and SiOx where x is 0.5<x<1.5. The matrix further contains a nitride. N1s binding energy of the nitride by X-ray photoelectron spectroscopy (XPS) has at least one peak in a range of more than 395 eV and 405 eV or less.

Disclosed are a positive electrode for a lithium secondary battery which can improve battery performance by coating the modified bottom-up graphene oxide (SBGO) on the positive electrode active material, and thus preventing the leaching of lithium polysulfide, a manufacturing method thereof, and a lithium secondary battery comprising the positive electrode. The positive electrode for the lithium secondary battery includes a positive electrode active material; and bottom-up graphene oxides coated on a surface of the positive electrode active material, where the bottom-up graphene oxides are cross-linked with each other through a hydrocarbon compound containing a cationic functional group.